Actually, it does, on page 19.
"During loader operation, fail safe sequence initiates (alternating red/green LED sequence)
Bad paintball is jammed in the feed tube
Anti-jam components are not installed correctly or are broken/missing
Reflective Sensors may be blocked by paint or dirt, or not working
Drive Cone may be installed incorrectly
Batteries may be low
Upper feed neck cover is not attached to the catch cup correctly
Motor may be worn out"